Search found 23 matches
74. Is k^(m + n) > 0? (1) k < 0. (2) k^(m – n) < 0. OA is E. I first simplified the question to: K^m(K^n)>0, which means that either K^m and K^n are both negative, or K^m and K^n are both positive. S1: k<0, insufficient since it does not tell us about m or n. S2: Simplify into K^m/K^n<0. This mea...
- by Dani@MasterGMAT
Thu Nov 11, 2010 2:29 am- Forum: Data Sufficiency
- Topic: Powers and inequalities
- Replies: 3
- Views: 1399
?? 1) Distance is same both ways, speeds are constant, therefore we can calculate the average speed using the formula - 2S1*S2/S1+S2 Lexy's average speed = 2*5*15/5+15 = 7.5 Ben's speed = 7.5/2 Time spent = Distance / speed = 5+5 / 7.5/2 = 10*2/7.5 = 20*2/15 hrs. In minutes = (20*2/15)*60 = 160 min...
- by Dani@MasterGMAT
Thu Nov 11, 2010 2:14 am- Forum: Problem Solving
- Topic: Some problems I can't solve
- Replies: 2
- Views: 1225
Use "number of equations = number of unknowns", but beware of the twist at the end. form equations: Let A be the investment in A, B in B, p be the interest in A. thus, the interest in B is 1.5p = p*3/2. Stat. (1): thus, 2 equations: A*p = 50 B*p*(3/2)=150. (technically should be p/100, but...
- by Dani@MasterGMAT
Tue Nov 09, 2010 9:38 am- Forum: Data Sufficiency
- Topic: Prep question
- Replies: 1
- Views: 1094
use "total number of arrangements" - "forbidden options": those options where the three men DO sit together. Calculate each separately, then subtract. Total number of arrangements = 7! ways to seat 7 people, regardless of limitations. forbidden options: number of ways where the m...
- by Dani@MasterGMAT
Tue Nov 09, 2010 9:11 am- Forum: Problem Solving
- Topic: Theater arrangements
- Replies: 1
- Views: 1010
The integer n is greater than 7. The average (arithmetic mean) of a group of n numbers is a. When 3 of the numbers are removed, the average of the remaining numbers is b. Which of the following expressions is the average of the 3 numbers removed? A. (na) / (n-3) B. {n(a-b)+3b} / 3 C. {n(a-b)+3b} / ...
- by Dani@MasterGMAT
Tue Nov 09, 2010 9:02 am- Forum: Problem Solving
- Topic: average
- Replies: 4
- Views: 1576
Have to come down firmly on the side of B here. The purpose of the plan is to get people to invest more resources into retirement services. If the reverse of B is true, then the money is just changing pockets - money left for retirement in plan z is now moved to this new retirement plan, but no &quo...
- by Dani@MasterGMAT
Mon Nov 08, 2010 6:38 am- Forum: Critical Reasoning
- Topic: In an attempt to encourage citizens
- Replies: 17
- Views: 3396
There are x high-level officials (where x is a positive integer). Each high level official supervises x2 mid-level officials, each of whom, in turn, supervises x3 low-level officials. How many high-level officials are there? (1) There are fewer than 60 low-level officials. (2) No official is superv...
- by Dani@MasterGMAT
Mon Nov 08, 2010 1:19 am- Forum: Data Sufficiency
- Topic: Officials
- Replies: 16
- Views: 5645
You can use reverse Plugging in to bypass the confusing algebra: The 5 answers are supposed to be the number of metal bars. Let's assume that a metal bar weighs 2 kilos, twice as much as a gold bar which weighs 1 kilo. Go down the answer choices, plug in the answer as the number of metal bars, add 1...
- by Dani@MasterGMAT
Mon Nov 08, 2010 1:08 am- Forum: Problem Solving
- Topic: gold-metal
- Replies: 1
- Views: 1145
Answer should be B - the key is to use numerical examples to clarify to yourself what the answer choices really mean. See my explanation below. A public-service advertisement advises that people who have consumed alcohol should not drive until they can do so safely. In a hospital study, however, sub...
- by Dani@MasterGMAT
Mon Nov 08, 2010 12:54 am- Forum: Critical Reasoning
- Topic: CR TC 48 Q12
- Replies: 4
- Views: 2469
Thanks shovan. But I still don't understand. Because the conclusion of this argument concerns whether the city can remove the pollution MOSTLY , we should assume that the city can choose the most efficient scrubbers from a lot of scrubbers . Can anyone help me find where I get wrong???? The problem...
- by Dani@MasterGMAT
Thu Nov 04, 2010 2:20 am- Forum: Critical Reasoning
- Topic: Scrubbers
- Replies: 7
- Views: 5239
Reverse Plug in the answer choices. Look at the answer choices: they're all fractions of the form 1/nx. nx is actually the values at the bottom of the fraction - you can now go and find which of the values 1, 32, 64, 81, 729 is both a square and a cube of a number. Since you want the greatest value ...
- by Dani@MasterGMAT
Thu Nov 04, 2010 12:33 am- Forum: Problem Solving
- Topic: square and cube
- Replies: 7
- Views: 3307
Triangle ABD is a right triangle with two legs 6 and 8, making the hypotenuse 10 (6:8:10 trio). Since ED=5, it follows that AE is also 5, and each of the is half of the hypotenuse AD. Several ways you can go from here: 1) small triangle EDC and large triangle ABD are similar (all angles are equal), ...
- by Dani@MasterGMAT
Thu Nov 04, 2010 12:23 am- Forum: Problem Solving
- Topic: For Geometry Lovers 2
- Replies: 2
- Views: 1086
Only seven people this century have been killed by the great white shark, the man-eater of the movies—less than those killed by bee stings. a. movies—less than those b. movies—fewer than have been c. movies, which is less than those d. movies, a number lower than the people e. movies, fewer t...
- by Dani@MasterGMAT
Wed Nov 03, 2010 4:12 am- Forum: Sentence Correction
- Topic: GMAtprep - expert help please (pronoun, appositive ?)
- Replies: 4
- Views: 1370
This is copy of OG12 Q89 and OA is correct. Could you please explain why D is wrong ? Both the statements in D sound correct too . My problem with D is the part where the argument "seeks" to explain the first boldface. It would be wrong to say that the argument's whole point is to explain...
- by Dani@MasterGMAT
Wed Nov 03, 2010 2:30 am- Forum: Critical Reasoning
- Topic: Bold face- executive
- Replies: 6
- Views: 1839
Dear sir, once again thank you for your help. but could you also plz explain me the following: y=56x^2 if x = 6 then it would be 56.6^2 then which actions do I need to take first? 6^2 and then multiply by 56? or 56^2.6^2? reagards Remember order of operations: PEMDAS Parentheses Exponents Multiplic...
- by Dani@MasterGMAT
Tue Nov 02, 2010 11:58 pm- Forum: Problem Solving
- Topic: Y+2/5
- Replies: 3
- Views: 1224